Multi media Learning(準備委員会企画講演2)

This paper deal about high-speed electrical spindles motor design problems. Electrical as well as mechanical critical aspects are taken into account, highlighting the main drawbacks and physical limits that the designer has to consider. The correlation between the volume minimization and the speed increase is discussed on the basis of the torque density trend of some commercial high-frequency roto-statoric units.

Key design aspects of electrical machines for high-speed spindle applications

Synthetic jet actuators for heat transfer enhancement – A critical review

This chapter presents an overview of many wearable devices of different types that have been proven in medical and home environments as being helpful in Quality of Life enhancement of elder adults. The recent advances in electronics and microelectronics allow the development of low-cost devices that are widely used by many people as monitoring tools for well-being or preventive purposes. Remote healthcare monitoring, which is based on non-invasive and wearable sensors, actuators and modern communication and information technologies offers efficient solutions that allows people to live in their comfortable home environment, being somehow protected. Furthermore, the expensive healthcare facilities are getting free to be used for intensive care patients as the preventive measures are getting at home. The remote systems can monitor very important physiological parameters of the patients in real time, observe health conditions, assessing them, and most important, provide feedback. Sensors are used in electronics medical and non-medical equipment and convert various forms of vital signs into electrical signals. Sensors can be used for life-supporting implants, preventive measures, long-term monitoring of disabled or ill patients. Healthcare organizations like insurance companies need real-time, reliable, and accurate diagnostic results provided by sensor systems that can be monitored remotely, whether the patient is in a hospital, clinic, or at home.

https://link.springer.com/content/pdf/10.1007%2F978-3-030-10752-9_10.pdf

Healthcare Sensing and Monitoring

Computer control systems for industrial processes need good processing power and memory resources, standard networking options and enough input/output lines for connecting to sensors, actuators and field buses. The explosive development of mobile devices running Android operating system brought us low cost devices that fulfill almost all these requirements for industrial control, missing only input/output lines. This last aspect was solved with launching of the latest 4.x Android release and of multi-interface Android USB hosts chips. The paper presents some test and results of controlling of an industrial system - hydraulic test bench- with a Google Nexus 7 tablet; hardware and software aspects are analyzed and advantages and disadvantages of this solution compared to PC-based one are discussed.

Control of industrial systems using Android-based devices

In this paper, a sensor using modified Split Ring Resonators (SRRs) is designed, simulated, fabricated, and used for advanced investigation and precise measurements of the real part and imaginary part solid dielectrics’ permittivity. Adding vertical strips tightly coupled to the outer ring of the SRR leads to the appearance of two resonant frequencies at 1.24 GHz and 2.08 GHz. This modified geometry also assures an improved sensitivity. Using the full wave electromagnetic solver, both the unloaded and loaded sensors are investigated. The numerical simulations are used to develop a mathematical model based on a curve fitting tool for both resonant frequencies, allowing to obtain analytical relations for real and imaginary parts of permittivity as a function of the sample’s thickness and quality factor. The sensor is designed and fabricated on 1.6 mm thick FR-4 substrate. The measurements of different samples, such as transparent glass, acrylic glass, plexiglass, and Teflon, confirm that the modified SRR sensor is easy to implement and gives accurate results for all cases, with measurement errors smaller than 4.5%. In addition, the measurements highlight the importance of the second resonant frequency in the cases in which numerical limitations do not allow the usage of the first resonant frequency (1 mm thick sample).

Modified Split Ring Resonators Sensor for Accurate Complex Permittivity Measurements of Solid Dielectrics

The present paper continues our investigations in the field of Supercapacitors or Electrochemical Double Layer Capacitors, briefly named EDLCs. The series connection of EDLCs is usual in order to obtain higher voltage levels. The inherent uneven state of charge (SOC) and manufacturing dispersions determine during charging at constant current that one of the capacitors reaches first the rated voltage levels and could, by further charging, be damaged. The balancing circuit with resistors and transistors used to bypass the charging current can be improved using the proposed circuit. We present here a complex variant, based on integrated circuit acting similar to a microcontroller. The circuit is adapted from the circuits investigated in the last 7–8 years for the batteries, especially for Lithium-ion type. The test board built around the circuit is performant, energy efficient and can be further improved to ensure the balancing control for larger capacitances.

Investigations on Active Balancing Circuits for Supercapacitor Banks

The paper presents the virtual and real investigations related to the fusing of PCB traces in high power applications. The reason of performing the research and related tests is that in real applications the current carrying capacity of PCB traces is different than the value presented in standards and datasheets or obtained after solving thermal equations. Based on the experimental results, the authors want to offer a first practical resource in the case of traces/tracks fusing, in order to avoid failures of electronic systems during the operation and, why not, to offer a design guide of developing PCB fuses, which could be interesting in some specific or low cost applications. In addition, the contribution introduces finally a few “rules of thumb”, useful to designers, fabricators and hardware engineers, which will deliver practice oriented advices for specialists involved in electronic design and manufacturing.

Advanced investigations on PCB traces fusing in high power applications

The paper presents the design and experiments of a multi-sensor device for use in agriculture crop irrigation. The soil and environment parameters are determined by specific sensors under the supervision of a microcontroller and sent through wireless communication to a central unit.. The novelty is the assembly of all the sensors on a single structure, together with the wireless communication circuitry to permit the power management of the electronics in order to allow an autonomous supplying from a solar cell in parallel with a Li-Ion accumulator. The design of the power source was done to assure a 3.3V voltage. The research work was firstly focused on soil parameters: moisture and temperature. The main experiments were performed in order to calibrate the method used for sensing the soil moisture..

http://www.ictcm.ro/sioptef3articole/ISSE%202014%20-Solar%20Powered%20Wireless%20Multi-sensor%20Device%20for%20an%20Irrigation%20System1.pdf

Solar powered wireless multi-sensor device for an irrigation system

The paper presents the ongoing activities within an European project for development of eLearning courses in microsystem technologies. It is a two-year project within the Leonardo da Vinci programme and the partners are from small and medium enterprises in microelectronics, training organizations and universities from four European countries — Romania, Bulgaria, France and Germany. The project is aimed at implementation of innovative approaches for performance- centred learning and development of new instruments in instructional design of task-performance-centred courses for education in Microsystems design and technology.

/pdf/training-microsystems-technologies-in-an-european-elearning-4qhltmh7zr.pdf

Norocel Codreanu

Papers

Modified Split Ring Resonators Sensor for Accurate Complex Permittivity Measurements of Solid Dielectrics

Investigations on Active Balancing Circuits for Supercapacitor Banks

Advanced investigations on PCB traces fusing in high power applications

Solar powered wireless multi-sensor device for an irrigation system

Training microsystems technologies in an European eLearning environment